What is the appropriate PK of the weakest acid or base that can be titrated in aqueous solution?
What is the appropriate PK of the weakest acid or base that can be titrated in aqueous solution?
See attached file for full problem description. Please answer questions 6, 7, 8, 9 ONLY.
Analytical Chemistry. See attached file for full problem description. Please answer questions 1, 4, and 5.
Explain using drawings the main components of a spectrophotometer and how a sample can be collected.
The determination of iron in industrial waste stream is often carried out by reacting the water sample with o-phenanthroline to form a red-orange complex that absorbs at 510 nm. Using the data shown in the following table construct the standard calibration curve and determine the concentration of Fe in the waste stream. The cuve ...continues
A square piece of nickel foil (.550 mm thick and 1.25 cm x 1.25 cm square) is allowed to react with F2(g) to produce a compound, nickel fluoride. a. How many moles of nickel foil are used? Density of nickel is 8.902 g/cm3. b. If 1.261 of nickel fluoride is produced, what is the formula of the compound? c. what is the comp ...continues
Buffer HEPES and MES got mixed. Identify which beaker contains HEPES.
You and a lab parnter prepare buffers to use in an experiment. Your partner prepares 200 ml 50 mM MES pH 6.0 while you prepare 200 ml of 50 mM HEPES pH 6.0. (MES and HEPES are the abbreviated names for two biological buffers often used in research labs). HEPES has MW 238.3 and pK = 7.48 MES has MW 195 and pK = 6.1 1. How ...continues
The dissociation of water increases as the temperature is raised: H20 --> H+ + OH-. If you adjust a buffer to pH 7.4 at room temperature (25 degree Celsius), then cool it down to 4 degree Celsius for an enzyme assay, will the pH increase or decrease?
You have 20 ml of 10% Bromophenol Blue (BPB). Using a 10% stock, how would you prepare 5 ml of a 0.2 % stock? (MW BPB is 670) Assume 1 % = 1 g/100ml. In addition, what is the molarity of the 0.2% BPB Stock?
What is the pH of a solution of 0.0004 M NaOH? What is the [H+] of a solution of 0.001 M NaOH?
Simple numerical answer with a brief summary is all that is needed.
